I don't know the exact numbers, but I could stock a small bank with the amount of Episode I and II coins I have (between Pit Droids, Battle Droids, Clone Troopers, and Clone Officers). I've got a fair amount of Episode III coins, too, but all these pale in comparison to the Stormtrooper coins (which aren't Legends, but it's still ridiculous) which number at least 52. Why did I start army building?

Too bad they aren't actual currency, although Hasbro could always do a "Jedi Master Points" type of promotion where 30 coins from SL would net you one free figure or something.